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Are you at all surprised? It's also already been proven that students in anti-drug programs are no less likely to use drugs later in life.

Education, while often purported as "the answer," doesn't always work, particularly if the student is being forced to accept the lesson rather than actively seeking it out him/herself. It's the same way in a math class -- the kid who feels like math is being thrust upon him/her will respond much differently than the kid who actively wants to learn math.

some recent research suggests that merely asking questions about risky behaviors makes people more likely to engage in those very behaviors. this happens because the question makes the behavior salient, and once salient it is more likely to be acted upon. i'd suspect a similar process is at work here.